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Concept of Prime Numbers

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definition

Prime number: The numbers other than 1 whose only factors are 1 and the number itself are called Prime numbers. 2, 3, 5, 7, 11,...... are examples of prime numbers.

notes

Prime Numbers:

Numbers

Factors

Number of Factors

1 1 1
2 1, 2 2
3 1, 3 2
4 1, 2, 4 3
5 1, 5 2
6 1, 2, 3, 6 4
7 1, 7 2
8 1, 2, 4, 8 4
9 1, 3, 9 3
10 1, 2, 5, 10 4
11 1, 11 2
12 1, 2, 3, 4, 6, 12 6
  • The number 1 has only one factor (i.e. itself).

  • There are numbers, having exactly two factors 1 and the number itself. Such numbers are 2, 3, 5, 7, 11, etc. These numbers are prime numbers.

  • Prime number: The numbers other than 1 whose only factors are 1 and the number itself are called Prime numbers.

  • 1 is neither a prime nor a composite number.
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